상아질 접착제의 두께가 치아와 복합레진 경계의 응력발생에 미치는 영향에 관한 유한요소법 연구
THE EFFECTS OF DENTIN BONDING AGENT THICKNESS ON STRESS DISTRIBUTION OF COMPOSITE-TOOTH INTERFACE : FINITE ELEMENT METHOD
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초록
이 연구의 목적은 5급 와동의 복합레진 수복에서 상아질 접착제를 비교적 두껍게 도포하거나 낮은 탄성계수(lowelastic modulus)를 가진 복합레진을 선택하는 방법을 택하여 수복물의 탄성율의 차이에 따른 치아와 복합레진 경계에서 발생하는 응력의 차이를 알아보는 것이었다. abfraction 병소가 있는 하악 제 1소구치를 유한요소법을 이용하여 모델로 만들었다. 병소는 상아질 접착제의 두께 (50μm, 100μm, 150μm) 및 복합레진의 종류를 달리하며 수복되었다. 170N의 교합압을 협측 또는 설측에서 가하여 상아질 접착제와 치아면에서의 Von Mises stress를 측정하였다. 상아질 접착제의 두께가 두꺼울수록 상아질 접착제면에 가해지는 Von Mises stresss 는 감소하였다. 낮은 탄성계수값을 가진 복합레진에서 Von Mises stress가 더 작았다. 치근상아질 경계(margin)가 법랑질 경계에서보다 더 큰 응력이 발생하였다. 상아질 접착제면에 작용하는 교합압의 영향을 감소시키기 위해 상아질 접착제를 두껍게 바르거나 낮은 탄성계수 값을 가진 복합레진을 사용하는 것이 추천된다.
Abstract
The aim of this study was to examine that thick dentin bonding agent application or low modulus composite restoration could reduce stresses on dentin bonding agent layer. A mandibular first premolar with abfraction lesion was modeled by finite element method. The lesion was restored by different composite resins with variable dentin bonding agent thickness (50μm, 100μm, 150μm). 170N of occlusal loading was applied buccally or lingually. Von Mises stress on dentin bonding agent layer were measured. When thickness of dentin bonding agent was increased von Mises stresses at dentin bonding agent were decreased in both composites. Lower elastic modulus composite restoration showed decreased von Mises stresses. On root dentin margin more stresses were generated than enamel margin. For occlusal stress relief at dentin boning agent layer to applicate thick dentin bonding agent or to choose low elastic modulus composite is recommended.
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